Formula: (Mg,Mn)9Zn4(SO4)2(OH)22.8H2O
Origin of name: for John Torrey (1796-1873), American naturalist who early studied Franklin, New Jersey, U.S.A. minerals
Crystal system: Monoclinic
Crystal class: 2/m
Twinning: Ubiquitous microscopic polysynthetic twinning on a twin plane in [010]
Unit cell: a = 16.486, b = 9.292, c = 10.619, β = 95.42°
Colour: Bluish white to colourless
Diaphaneity: Translucent
Luster: Vitreous to almost pearly, dull
Habit: massive, granular, rare blocky crystals to 1 mm, in parallel growth
Hardness: 3
Specific gravity: 2.67
Cleavage: 1; {010} good
Tenacity: Somewhat brittle
Streak: White
Synonyms/varieties:
Comments: Very rare, in veinlets cutting calcite–franklinite–willemite ore in a metamorphosed stratiform zinc orebody.
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